Duel Automation Hosts

Could you please explain
the purpose and/or logic of having one automation host attached to a testset, and one attached to a testcase? As it currently
stands, automation hosts can be added via the administration > Integration
> Test Automation section and can also be added via Testing tab >
Automation hosts. That functionality has caused confusion over the past
week and we would like a clear justification regarding the intents and purposes
of having duel automation hosts implemented in SpiraTeam.